Why does Romo refuse to throw the ball away? He takes bad sacks.
There are multiple reasons why he does this:
He's as tough as they come.
He's a warrior.
He's a competitor.
He has an awesome o-line that allows him to do this.
He doesn't have the same strength and health (Gasp he's getting old) to throw into tight coverage so he has to wait for perfect opportunities.
He doesn't want to throw wild gunslinger picks anymore.
He only has one WR that he can throw those tight "Zipcode" passes to, everybody else has to be perfectly wide open.
Having said all that he's healthier and stronger today then he has been in nearly 3 seasons. I expect to see more zip on his passes this year but he clearly doesn't have the same capabilities he had earlier in his career so he has to be more calculated and precise with his pass attempts.
We are seeing less picks now but more sacks. I'm sure Garrett's final touch will be to have more quick options or to throw the ball away sometimes..